Hello, My 2003 honda civic’s AC was not as cold as I thought it should be so I went to the auto parts store and bought a gauge and some 134a. Initalliy the gauge was at 39psi and in my heat (95F) the gauge I bought said it should between 45-55psi. After puting in a bottle and a half (18oz) of 134a,…

You have likely overcharged it. If you look under the hood, there should be a sticker that shows the capacity of the system. If it was cooling at all, it likely had more than half what is listed there onboard already, now plus the 18oz. you’ve added. At this point, the best thing you could do wou…

Two things, one are you taking the pressure with the AC on and running? Also Is the compressor engaging??

I don’t recall ever charging an AC system and seeing the low side pressure above 40psi when everything was operating correctly. With adequate air over the condenser fully charged systems operating at 1500 to 2000 rpm have always run 32 to 40 psi low side and 175 to 300psi high side depending on outs…

Read this thread http://community.cartalk.com/discussion/2285973/how-cold-should-the-ac-be-08-civic#latest

You CAN NOT properly service an A/C system unless you are monitoring BOTH high and low pressure in the system…if you overcharge the system, the high side will respond first, with pressures quickly climbing way above normal…With the $20 recharge kits, you will be unaware of this and can easily damage…

Thanks for the responses, I did charge with the AC on and the Compressor is engaging. I’m going to go get a high pressure gauge tomorrow but I don’t think I overcharged it…It’s blowing 55F in 95F weather.

55 degrees is right where you want to be in hot weather. It could still be overcharged. Did you look at the capacity? If so, what is it?

While there are really qualified people here on a/c, I think they should be smarter about responding. No one using a bottle from walmart is going to push the engine revs to 15 -20hun while filling the system. And since you arent there you have no idea on an overfill. There are other clues like short…

An experienced, seasoned tech can get your automotive a/c system within ounces of proper charge using nothing more than his eyes, ears, and fingertips. But those guys are getting harder and harder to find. Get some gauges, tell us the readings. But also note for us whether the condenser fan(s) are …

Overcharge AC

Maintenance/Repairs

Rod-Knox June 24, 2012, 7:36pm 11

Some of us just bungle our way through life, euryale1. But I didn’t recommend filling anything. I merely mentioned the normal pressures from a properly operating automotive AC when testing it PROPERLY with the PROPER equipment. But please feel free to point out any mistakes that I make in the future. I am always eager to learn from those more knowledgeable than myself.

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Overcharge AC

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